Fix WebWorker Vite compatibility

[orimay]

Thank you for submitting this pull request! We appreciate you spending the time to work on these changes.

What is the motivation?

createWasmWorkerEngines is incompatible with Vite-based projects

What does this change do?

Allows to create worker, specifying worker agent:

import WorkerAgent from '@surrealdb/wasm/worker?worker';

const db = new Surreal({
  engines: createWasmWorkerEngines({
    createWorker: () => new WorkerAgent(),
  }),
});

What is your testing strategy?

I was not able to test it due to a missing dependency

import type { ConnectionOptions } from "../wasm/surrealdb";

Is this related to any issues?

#497 (comment)

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[sandros94]

I wanted to help trying this out but failing to build wasm locally (getting wasm32-unknown-unknown which I honestly do not know what I'm doing wrong).

Theoretically, as long as Vite can statically parse the worker-agent, it should be able to interpret the inner new URL("../wasm/surrealdb_bg.wasm", import.meta.url) from initializeLibrary in common.ts, meaning no additional fixes are required